Bioelectric impedance measuring apparatus
First Claim
1. A bioelectrical impedance measuring apparatus comprising:
- an impedance measurement unit for measuring a bioelectrical impedance which comprises electrodes to contact with a living body, anda determination unit for determining the contact condition of the living body with the electrodes by use of a parameter associated with a phase difference of a true impedance of the living body, the true impedance being represented by fluctuation variables representing fluctuations based on impedance fluctuation factors occurring in the impedance measurement unit, and by voltage variables representing a voltage based on a resistance component of the bioelectrical impedance measured by the impedance measurement unit and a voltage based on a reactance component of the bioelectrical impedance measured by the impedance measurement unit.
1 Assignment
0 Petitions
Accused Products
Abstract
There is provided an apparatus capable of carrying out an accurate bioelectrical impedance measurement by determining whether contact of a living body with electrodes used at the time of the bioelectrical impedance measurement is normal or not more accurately. The apparatus uses a parameter associated with a phase difference in determining the contact condition of the living body with the electrodes. As the parameter associated with a phase difference, the apparatus uses a value represented by X/R wherein R is a resistance component in a bioelectrical impedance to be measured and X is a reactance component in the bioelectrical impedance and determines that contact of the living body with the electrodes is not normal when the value of X/R is out of a determination range such as a<X/R<b (a and b are real numbers).
51 Citations
9 Claims
-
1. A bioelectrical impedance measuring apparatus comprising:
-
an impedance measurement unit for measuring a bioelectrical impedance which comprises electrodes to contact with a living body, and a determination unit for determining the contact condition of the living body with the electrodes by use of a parameter associated with a phase difference of a true impedance of the living body, the true impedance being represented by fluctuation variables representing fluctuations based on impedance fluctuation factors occurring in the impedance measurement unit, and by voltage variables representing a voltage based on a resistance component of the bioelectrical impedance measured by the impedance measurement unit and a voltage based on a reactance component of the bioelectrical impedance measured by the impedance measurement unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A bioelectrical impedance measuring apparatus comprising:
-
an impedance measurement unit for measuring a bioelectrical impedance which comprises electrodes to contact with a living body, and a determination unit for determining the contact condition of the living body with the electrodes by use of a parameter associated with a phase difference of a true impedance of the living body or an external reference unit, wherein the true impedance is represented by a true impedance component variable RB indicating a resistance component of the true impedance of the living body or external reference unit, and a true impedance component variable XB indicating a reactance component of the true impedance of the living body or external reference unit, wherein the true impedance is calculated by the following equation; where the fluctuation variable CR indicates fluctuations based on a scale factor and phase of the resistance component of the living body or external reference unit;
the fluctuation variable CX indicates fluctuations based on a scale factor and phase of the reactance component of the living body or external reference unit;
the measured voltage variable VBR indicates a voltage based on the resistance component of the living body or external reference unit;
the measured voltage variable VBX indicates a voltage based on the reactance component of the living body or external reference unit;
the measured voltage variable VRR indicates a voltage based on a resistance component of an internal reference unit;
the measured voltage variable VRX indicates a voltage based on a reactance component of the internal reference unit;
the fluctuation variable VOSR indicates fluctuations based on an offset voltage in a resistance component axis direction; and
the fluctuation variable VOSX indicates fluctuations based on an offset voltage in a reactance component axis direction.- View Dependent Claims (9)
-
Specification